// Scintilla source code edit control
/** @file ExternalLexer.h
 ** Support external lexers in DLLs.
 **/
// Copyright 2001 Simon Steele <ss@pnotepad.org>, portions copyright Neil Hodgson.
// The License.txt file describes the conditions under which this software may be distributed.

#ifndef EXTERNALLEXER_H
#define EXTERNALLEXER_H

#if PLAT_WIN
#define EXT_LEXER_DECL __stdcall
#else
#define EXT_LEXER_DECL
#endif

#ifdef SCI_NAMESPACE
namespace Scintilla {
#endif

typedef void*(EXT_LEXER_DECL *GetLexerFunction)(unsigned int Index);
typedef int (EXT_LEXER_DECL *GetLexerCountFn)();
typedef void (EXT_LEXER_DECL *GetLexerNameFn)(unsigned int Index, char *name, int buflength);
typedef LexerFactoryFunction(EXT_LEXER_DECL *GetLexerFactoryFunction)(unsigned int Index);

/// Sub-class of LexerModule to use an external lexer.
class ExternalLexerModule : public LexerModule {
protected:
    GetLexerFactoryFunction fneFactory;
    char name[100];
public:
    ExternalLexerModule(int language_, LexerFunction fnLexer_,
        const char *languageName_=0, LexerFunction fnFolder_=0) :
        LexerModule(language_, fnLexer_, 0, fnFolder_),
        fneFactory(0) {
        strncpy(name, languageName_, sizeof(name));
        name[sizeof(name)-1] = '\0';
        languageName = name;
    }
    virtual void SetExternal(GetLexerFactoryFunction fFactory, int index);
};

/// LexerMinder points to an ExternalLexerModule - so we don't leak them.
class LexerMinder {
public:
    ExternalLexerModule *self;
    LexerMinder *next;
};

/// LexerLibrary exists for every External Lexer DLL, contains LexerMinders.
class LexerLibrary {
    DynamicLibrary  *lib;
    LexerMinder     *first;
    LexerMinder     *last;

public:
    LexerLibrary(const char *ModuleName);
    ~LexerLibrary();
    void Release();

    LexerLibrary    *next;
    std::string         m_sModuleName;
};

/// LexerManager manages external lexers, contains LexerLibrarys.
class LexerManager {
public:
    ~LexerManager();

    static LexerManager *GetInstance();
    static void DeleteInstance();

    void Load(const char *path);
    void Clear();

private:
    LexerManager();
    static LexerManager *theInstance;

    void LoadLexerLibrary(const char *module);
    LexerLibrary *first;
    LexerLibrary *last;
};

class LMMinder {
public:
    ~LMMinder();
};

#ifdef SCI_NAMESPACE
}
#endif

#endif
